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Summary - Build

Combine build, tag and .dockerignore to create an image.

Summary: build

In this group:

  • docker build -t name:tag [-f Dockerfile] context produces an image.
  • A tag is a pointer; fixed version tags are used in production.
  • The context is sent to the daemon; files outside it can't be accessed.
  • Layers are cached; everything after a changed layer is rebuilt. Rarely changing steps are written at the top.
  • .dockerignore shrinks the context and keeps secret files out.
docker build --pull -t api:1.2.0 -t api:latest .
docker history api:1.2.0

Practice Version and prepare to publish

Write three commands: build api:1.2.0 updating the base image; also give this image the name ali/api:1.2.0; show the layer history.

Starter code

terminal
# buraya yaz

Sample solution

terminal
docker build --pull -t api:1.2.0 .
docker tag api:1.2.0 ali/api:1.2.0
docker history api:1.2.0

Expected output

[+] Building 6.3s (10/10) FINISHED
 => naming to docker.io/library/api:1.2.0 done
IMAGE          CREATED         CREATED BY                 SIZE
4f1e2d3c4b5a   2 seconds ago   CMD ["python" "app.py"]    0B

Questions and answers

Review the lesson questions together with their answers. To test yourself, solve the lesson interactively.

1 Which Dockerfile order uses the cache best?

  • Source code → FROM → install
  • The order doesn't matter
  • FROM → dependency file → install → source code Correct answer
  • FROM → source code → install

Explanation: The most frequently changing step is written last.

2 Build the image with a tag.

Question 
docker build ____ api:1.2.0 .
Answer 
docker build -t api:1.2.0 .

Explanation: -t (tag) gives name:tag.

3 Match.

Term Meaning
docker build Produces an image
.dockerignore Context filter
--no-cache Build without cache
docker tag Extra name

All lessons in Beginner

1 What is Docker?

  1. What is Docker?
  2. Containers and virtual machines
  3. Images and containers
  4. Docker architecture
  5. Use cases
  6. Summary - What is Docker

2 Installation and first commands

  1. Installing Docker
  2. docker version
  3. docker info
  4. The hello-world container
  5. Docker Desktop
  6. Summary - Installation

3 First container

  1. docker run basics
  2. Running in the background
  3. docker ps
  4. docker stop and rm
  5. docker logs
  6. Summary - First container

4 Dockerfile basics

  1. What is a Dockerfile?
  2. The FROM instruction
  3. The RUN instruction
  4. COPY and ADD
  5. CMD and ENTRYPOINT
  6. Summary - Dockerfile

5 Build and images

  1. docker build
  2. Tagging images
  3. Build context
  4. Layers and cache
  5. .dockerignore
  6. Summary - Build

6 docker run options

  1. Interactive mode
  2. Naming containers
  3. Restart policy
  4. Working directory
  5. Switching users
  6. Summary - docker run

7 Image management

  1. docker images
  2. docker rmi
  3. docker pull
  4. docker push
  5. docker tag
  6. Summary - Image management

8 Port mapping

  1. The port concept
  2. The -p flag
  3. Multiple ports
  4. Random ports
  5. IP binding
  6. Summary - Port mapping

9 Volumes and data

  1. Data persistence
  2. Named volumes
  3. The -v flag
  4. Bind mounts
  5. Volume management
  6. Summary - Volumes

10 Environment variables

  1. The -e flag
  2. The ENV instruction
  3. The ARG instruction
  4. env-file
  5. The WORKDIR instruction
  6. Summary - Environment

11 Project: docker-compose

  1. Compose design
  2. Service definition
  3. Database service
  4. Volume and network
  5. Putting it together - compose

12 Docker Hub and registry

  1. What is Docker Hub?
  2. docker login
  3. Searching images
  4. Official images
  5. Private registry
  6. Summary - Registry

13 Network basics

  1. Network drivers
  2. docker network ls
  3. Bridge network
  4. Container connectivity
  5. Publishing ports
  6. Summary - Network

14 Beginner final

  1. Challenge - Dockerfile
  2. Challenge - Build and run
  3. Challenge - Volume
  4. Challenge - Compose
  5. Challenge - Beginner project